Flexible stay-bolt connection for boilers.



B. E.-D. STAFFORD. FLEXIBLE STAY BOLT CONNECTION FOR BOILERS.

APPLI ATlON r CT 301915 1,250,24Q I I atented De0.18,1917.

WI NESSES 20 provided with an' openingof a size suitibarren erases reruns b rrios BENJAMIN E. D. STAFFOBD; 0F IPI'ETSBURGH, PENNSYLVANIA, ASSEGNOR T0 FLANNERY -BOL'.K C@IIPANY. 0F PITTFSBUEtfStI-I, PWNSYLVANIA. I

sp i if ma raroneu Dec. is, its '7.

Application filed October 30, 3915. Serial no. 53,868.

To all whom it may concern:

Be it known that I, Bnuaamu E. D. STAFFORD, a citizen of the United States, and a resident of Pittsburgh. in the county oft Allegheny and State of Pennsylvania, have invented certain new and useful improvemonts in Flexible Stay-Bolt Connections for Boilers; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art 'to which it appertains to make and use the, same.

My invention relates to an improvement in flexible stay bolt connection for boilers, and is an immovement onvgtllieemistruction disclosed in application 'i'lerial Number 44,638 tiled by Peter F. lallagher, August 5th. 1915. 1 i

in the application above referred'to, the roof plate or'outcr sheet of the boiler is cient. to receive the end of the sleeve carrying the head of the bolt, the sleeve being secured in said opening by Welding.

In the'devieeas illustrated in said application, the sleeve has no direct bearing on the root plate and hence, the Welded joint has to sustain the hammer blows in riveting up the end and all the stresses, and partiouis a view partly in elevation and partly in section showing the manner of attaching the sleeve to the roof plate of the boiler; Fig".

2 is a view showing the application of the bolt to a roof plate that is atlan angle to the crown sheet and Figs. 3 and tshow curved plates counterbored to receive the sleeves.

I 1 represents the root plate or sheet of a locomotive boiler, provided with an opening 2 for each stay bolt, the said o ening being slightly larger than the Shani: 3 of the bolt, so as to permit of relativelytree movement of the shank in said opening. The plate 1 is counterborcd on its outer surface around the opening 2, to receive and form a seat for the end of the sleeve 4, the

properly placed with relation to the bolt '3 and is n-ovided exteriorlv at its outer end With threads for the attaclnnenr of the cap 7, the inner face of the latter being curved to conform to the curvature of the head of the bolt, sutiicicnt clearance however being left torn limited movement of the head of the bolt in the sleeve and cap, or an equal movement of the sleeve and cap on the head. The outer edge or periphery of the cap is made hexagonalfor angular for the. attachment of the wrench employed in screwing and unscrewing the cap. The inner end of the sleeve is preferably made to low outwardly, as shown, so that; after it is welded to the sheet, the metal of. the sleeve will underlie the metalof the weld and thus lock the sleeve solidly in place. In assembling the parts, the sleeves are opening in the outer plate, after which the Welding composition or filler is applied at the outside as at 8, between the sleeve and the shoulder i) foru'ied by counterboring the. outer plate, and also preferably at the inside at the juncture of the sleeve and plate as at 10, after which the weld is effected by the Ozzy-acetylene welding method, or by electrically welding the parts. The welding' fuses the metals so that the union between the plate and sleeve is of a homogeneous character thereby securing all ot the advantages of a sleeve integral With the plate as angle to the crown sheet 10, the sleeve beingwelded to the plate at the outer edge" only of the sleeve. 7

In Figs. 3 and 4 l. have shown curved plates, one convex and the other concave, oounter'oored for the, reception of a. sleeve or bushing.

The head of the bolt rests within the sleeve or the curved seat 5 in the latter in the usual and. well known manner, and is covered, and protected by the removable threaded outer end to which the semi-spherical head 6 is secured and a button head inner end for attachment to the inner sheet. These details and the manner of securing the bolt to the inner sheet are immaterial as my invention relates more particularly to the method of mounting the sleeve the roof plate.

In the prior methods of securing the sleeves or bushings to the root plate of a locomotive boiler, for the application of a flexible stay bolt, the end of the sleeve has been located within the opening in root plate, and secured by threads, as in the T ate type of stay bolt, or by fusing as in the Gallagher type. Both of these methods necessitate the employment of a larger hole or opening than is desirable; they limit the dimensions of the sleeve section and leave the sleeve unsupported except by the threads or weld.

By counterbo'ring the plate for a clean and straight bearing for the bushing, sleeve or socket, which is subsequently welded in the counterbore, I am enabled to use a much smaller opening in the plate and thus conserve its strength, and at the same time provide a solid abutment for the sleeve on the plate, which is sufiicient to withstand the hammer blows in testing the bolt, in riveting up the end of the latter; in tightening up the caps and other shocks to which they are subjected in-assembling and testing.

all stress on the stay bolts and sleeve or bushing due to boiler pressure, is borne directly by the plate 1 instead of by the threads or welded joint.

The bushings or sleeves can ofi to the desired angle to conform to the angle of stay bolt installation, and in the case of a pressed steel socket, as shown in Fig. 2, the part thatis to be milled 05 to conform to the angle of the outer plate, can be so shaped that when cut to the angle it will approximate a true circle. The socket top however is round or circular in shape.

It is evident that many slight changes might be resorted to in the relative arrange- Againbe machined ment of parts shown and described without" departing from the spirit and scope of my invention. Hence I would have it under'- stood that I do not wish to confine myself;

- opening for to the exact construction'and arrangement ot parts shown and described except as reuircd by the scope of the appended claims.

Having fully described my invention what 7 counterbore around and communicating with a-support for the head of the said opening, bolt seated in said counterbore and secured therein by welding and a cap detachably se cured to the outer end of the support.

3. In a stay bolt connection for boilers, the combination of a boiler plate having an opening for a stay bolt, aslceve seated on the plate around said bolt opening and secured on said plate by welding and a cap screwed to the outer end of said sleeve for closing the bolt opening and covering the head of the bolt.

4. In a stay bolt connection for boilers,

the combination of a boiler plate having an said plate around the bolt opening and welded thereto at the outer edge and also the inner side of the inner end of said sleeve and a cap detachably secured to the outer end of said sleeve. In testimony whereof, specification in the presence 0% two subscribing witnesses.

BENJAMIN E. D. STAFFORD.

"Witnesses EDWIN S. RYoE,

F. H. ALLISON.

I have signed this till a stay bolt, a sleeve seated on 

